package com.xue.reggie.filter;


//检查用户是否以及完成登录

import com.alibaba.fastjson.JSON;
import com.xue.reggie.common.BaseContext;
import com.xue.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName = "LoginCheckFilter",urlPatterns = "/*")  //拦截器名字和拦截路径
@Slf4j
public class LoginCheckFilter implements Filter { //因为这样没办法直接使用拦截器，所以需要继承filter接口，但是会报错，所有需要实现它的do方法
    //路径匹配器，支持通配符
    public static  final AntPathMatcher PATH_MATCHER= new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;  //因为这边的doFilter方法是Servlet类型，我们需要使用的是http类型，所以进行强转
        HttpServletResponse response =(HttpServletResponse) servletResponse; //同上

        //1。获取本次请求的url

        String requestURI = request.getRequestURI();
        log.info("拦截到请求:",requestURI);
        //2.判断本次请求是否需要处理
        //检查用户的登录状态

        //把不需要处理的请求放到这边
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"

        };


        boolean check = check(urls, requestURI);
        //3.如果不需要处理，则直接放行

        if (check)
        {
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        //4-1.判断登录状态，如果亿登录，则直接放行

        if (request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录，用户id为:{}",request.getSession().getAttribute("employee"));

            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            Long id = Thread.currentThread().getId();
            log.info("线程id为：{}",id);

            filterChain.doFilter(request,response);
            return;
        }

        //        4-2、判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已登录，用户id为：{}", request.getSession().getAttribute("user"));

            Long userId= (Long) request.getSession().getAttribute("user");

            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request, response);
            return;
        }


        log.info("用户未登录");
        //5。如果未登录则返回未登录结果,通过输出流方式向客户端页面相应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

    }

    /**
     * 路径匹配检查本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI) {
        for (String url : urls) { 
            boolean match = PATH_MATCHER.match(url, requestURI);
            {
                if (match) {
                    return true;
                }
            }

        } return false;
    }




}
